Electrical loud-speaking receiver



July 7, 1925.7

ELECTRICAL LOUD SPEAKING RECEIVER A. P. PINKLER vwemtoz Patented, July T1', 1925.

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`ARTHUR I. PINKLER, 0F WATEBBURY, CONNECTICUT, AASSIGJSTOR. T0 THE BRISTOL COMPANY, OIl ATERBURY, CONNECTICUT,`A CORPORATION YOE CONNECTICUTr nnncfrarcnn Lounsrnnkrne RECEIVER.

application nien Aagusfzs, i921. sriai- N0. 494,697.

To all whom it may concern.

Be it known that I, ARTHUR P. PINKLER,

l a citizen of the United States, and a resident of -Waterbury, in the county of New ceiver device b eing'generally termed Loud speaking receivers.

lt is the object of the invention to provide 'a compact, `ruggedly` constructed receiv'erdevice of this character land one which shall be comparatively light andof low powerconsumption and in which the arrangement of parts is such, moreover, that undesirablevibrations are obv-lated, the active parts being simple, light and free to respond.`

The nature of the invention will, however, best be understood when described in connection with the accompanying drawing, in which- Fig., 1 Ais a longitudinal section thru the receiver device. I

Fig. i2 is a horizontal section taken on the line 2 2, Fig. 1, looking in the direction of the arrows. y

Fig. 3 is a transverse section taken on the line 3 3, Fig. 1, looking in the direction of the arrows. Y'

Similar characters of reference designat corresponding .parts thruout the several views. f i

Referring to the drawings, 10 desi ates a suitable easing or container wherein the entire apparatus may conveniently be mounted and housed. The device itself comprises a permanent U-shapemagnet 11, 4 u

joints is involved. The adjustment of the one leg being shorter than the` other and having pole pieces' 12 and 13 directed at right angles. from the ends thereof.v The pole piece 13, furthermore, is provided with a solenoid 1a thru which current passes, as

leads 15 are connected to received `from. a transmitting apparatus (not shown) and as is well understood.v Suitable the said solenoid for this purpose.

The magnet 11, in addition, carries a sound box 16 which is adjustably secured thereto for slight angular motion, the adjustment bengei'ected, for example, thru suitable nuts 17 working on the screw 18.

A nut 19 servesy to secure the sound box and attached magnet to, the coverA of the casing 10; and an outletl 20'extends' thru the said cover and may receive a ysuitable horn 21 or other amplifying member.

.In order to eii'ect the amplification, the diaphragm 22 of thesound box isto be vibrated in accordance witlipulsations re.I ceived from the` transmitting circuit 15 in which electrical impulses have been greatly strengthened by the introduction of a localbattery (not shown); and their increased eii'ect is to be delivered to the solenoid 14,

all of which is well understood and forms no part of the' present invention. However, in accordance wlth the invention, the eiiect of these pulsation on` the magnetic attractiony of the pole piece 13 is conveyed to the diaphragm 22 in a most direct and positive manner; and, ,for'tliis purpose, a free onepiece lever 23 is provided and is mounted therebetween, said lever being preferably provided with a' stamped-out late-ral rib 23. For example, at its one end, it is positively attached in any Well-known or special manner to the center ci the diaphragm 22 and at its other end it carries an armature 24 in proximity toy the end of the poleV piece 13 Iso as to be influenced thereby 'and vibrated in accordance withy pulsations of current prevailing in the solenoid. Lever'23, moreover,

is fulcrumed on the other polebpiece, merely resting thereonpand, p ref'eraA is guided against lateral displacement as by means of a pin 25 extendingI romgthe pole piece 12 and'tting into a groove 26 of the lever.

In this manner, a direct and positive mul'- t-iplying connection isaliiorded by a single part; and thus obviates any extraneous and undesirable vibrations such as occur when the us'ual intricate system of levers and sound box as a whole to vary Ythe air gap between the armature 24 and ole' piece .13, affords, moreover, means for elicately adjusting the apparatus. The apparatus, furthermore, while of the utmost simplicity is also extremely compact and of rugged construction so that it is not likelly readily to get out oforder even with roug usage. As a consequence, the amplification aiiorded by the device is of a high degree, for example, a ratio of diaphragm movement to armature movement of four to one; and the reproduction is of high quality. l

the opposite end of said lever being free and 10 carrying an armature under the influence of the other of said pole pieces, and means to vary the attraction of the last-named pole piece for the said armature.

`Signed ,at VatQrbUry, in the county of 15 New Haven and State of Connecticut this 20th day of August A. D., 1921.

ARTHUR P. PINKLER. 

